I have a washing machine that overflows at the drain pipe when it runs the water out of the tub. I have run a snake through the pipe behind the washer and poured acid down the pipe, now I have put the drain hose inside a rubber hose so it can not leak, is this okay.

Roto-Rooter Time ! Your main is clogged down the slope from washer. Have your drain cleaned.

Sealing off washer stand pipe with any kind of fitting ( hose in your case ) is really only a temporary solution. Your problem should be dealt with in proper timely manner. Washer pumps are not designed to push water down the pipe.

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I have put the drain hose inside a rubber hose so it can not leak, is this okay

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Milo was correct about snaking your washer drain line. (instructions on how to snake your drain later ) However, I disagree with him about sealing off the stand pipe and making it a closed system.. The newer,more powerful washer pumps can overpower a 1 1/2" trap and stand pipe. Milo says, [QUOTE][Sealing off washer stand pipe with any kind of fitting ( hose in your case ) is really only a temporary solution. /QUOTE]
Well in my case it is a permanent solution to a over flowing stand pipe. I've had one installed for the last five years. He also goes on to say,

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Washer pumps are not designed to push water down the pipe.

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That's exactly what washer pumps are designed to to. The only problem is that they push water down the pipes so fast older washer stations aren't able to keep up and over flow. That's why we make the connection between the hose and the standpipe a closed one. It's a lot cheaper then ripping out the old washer station and increasing the pipe and trap size. If jamingthe hose down the standpipe to stop overflows works for you I see no reason to change it. B ut I would snake the drain line from the washer roof vent. Put out enough cable to reach the base and 20 feet more to get into the main. Here are three ways to seal off the hose connection, (see images)
Good luck, Tom